GeForce GT 430 (OEM) vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which has a clock frequency of 876 MHz and a DDR3 memory frequency of 1000 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GT 430 (OEM)		60 Watts
	Difference: 20 Watts (50%)

Memory Bandwidth

In theory, the GeForce GTX 850M should be 11% quicker than the GeForce GT 430 (OEM) in general, because of its greater bandwidth. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce GT 430 (OEM)		28800 MB/sec
	Difference: 3200 (11%)

Texel Rate

The GeForce GTX 850M is much (more or less 213%) more effective at AF than the GeForce GT 430 (OEM). (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 430 (OEM)		11200 Mtexels/sec
	Difference: 23840 (213%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 850M is the winner, and very much so. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 430 (OEM)		2800 Mpixels/sec
	Difference: 11216 (401%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.